on Just Publishing Advice:
The denouement and an epilogue are literary devices
For new writers, it is worth understanding the difference between these two elements of a story.
While not always essential in short stories, a novel will always have a denouement.
Gustav Freytag, a German novelist and playwright, outlined the five parts to a plot.
Using the Freytag pyramid, the plot of a story is made up of five parts: exposition, rising action, climax, falling action, and denouement.
The exposition could also be called the introduction while denouement could entail resolution, revelation or even catastrophe.